Abstract Infrared femtosecond optical vortices open up many new research fields, such as micro–nano manipulation, time-resolved nonlocal spectroscopy in solids, vortex secondary radiation and particle generations. In this article, we demonstrate a laser system based on two-stage parametric amplifier. our experiment, 1.45 μm signal pulses with energy of 190 μJ 1.8 idler 158 have been obtained, t...

We provide a theoretical description of light scattering by spherical particle the permittivity which is modulated in time at twice frequency incident light. Such acts as finite-sized photonic crystal and, despite its subwavelength spatial extent, can host optical parametric amplification. Conditions Mie resonances sphere are derived. show that time-modulated materials route to tailor direction...

Microwave parametric amplifiers operating at the quantum noise limit have become indispensable tools for a range of cryogenic technologies. These are typically constructed from nonlinear Josephson junctions, which ability to amplify high-power signals. This study reports device based instead on weakly kinetic inductance intrinsic superconducting film niobium titanium nitride. The amplifier offe...